SAP Note 2787227 – Solution Manager 7.2 FP Stack 09: recommended corrections
There is a strict relationship with SolMan SP9 and ST-OST. You need to wait until SP4 is released. This is planned for mid of August:
https://blogs.sap.com/2019/07/02/for-your-convenience-sps09-available-for-sap-solution-manager-7.2/
SAP Note 394616 – Release strategy for SAP Solution Manager